diff --git a/opentelemetry-otlp/CHANGELOG.md b/opentelemetry-otlp/CHANGELOG.md
index bc8046f9ad..dc859dd542 100644
--- a/opentelemetry-otlp/CHANGELOG.md
+++ b/opentelemetry-otlp/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## vNext
 
+- The `OTEL_EXPORTER_OTLP_TIMEOUT`, `OTEL_EXPORTER_OTLP_TRACES_TIMEOUT`, `OTEL_EXPORTER_OTLP_METRICS_TIMEOUT` and `OTEL_EXPORTER_OTLP_LOGS_TIMEOUT` are changed from seconds to miliseconds.
+
 ## 0.28.0
 
 Released 2025-Feb-10
diff --git a/opentelemetry-otlp/src/exporter/http/mod.rs b/opentelemetry-otlp/src/exporter/http/mod.rs
index 650358533e..10342a858a 100644
--- a/opentelemetry-otlp/src/exporter/http/mod.rs
+++ b/opentelemetry-otlp/src/exporter/http/mod.rs
@@ -120,7 +120,7 @@ impl HttpExporterBuilder {
             .or(env::var(OTEL_EXPORTER_OTLP_TIMEOUT).ok())
         {
             Some(val) => match val.parse() {
-                Ok(seconds) => Duration::from_secs(seconds),
+                Ok(seconds) => Duration::from_millis(seconds),
                 Err(_) => self.exporter_config.timeout,
             },
             None => self.exporter_config.timeout,
diff --git a/opentelemetry-otlp/src/exporter/mod.rs b/opentelemetry-otlp/src/exporter/mod.rs
index bec1c809bb..219ea76387 100644
--- a/opentelemetry-otlp/src/exporter/mod.rs
+++ b/opentelemetry-otlp/src/exporter/mod.rs
@@ -52,7 +52,7 @@ const OTEL_EXPORTER_OTLP_PROTOCOL_HTTP_JSON: &str = "http/json";
 /// Max waiting time for the backend to process each signal batch, defaults to 10 seconds.
 pub const OTEL_EXPORTER_OTLP_TIMEOUT: &str = "OTEL_EXPORTER_OTLP_TIMEOUT";
 /// Default max waiting time for the backend to process each signal batch.
-pub const OTEL_EXPORTER_OTLP_TIMEOUT_DEFAULT: u64 = 10;
+pub const OTEL_EXPORTER_OTLP_TIMEOUT_DEFAULT: u64 = 10000;
 
 // Endpoints per protocol https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md
 #[cfg(feature = "grpc-tonic")]
@@ -87,7 +87,7 @@ impl Default for ExportConfig {
             // don't use default_endpoint(protocol) here otherwise we
             // won't know if user provided a value
             protocol,
-            timeout: Duration::from_secs(OTEL_EXPORTER_OTLP_TIMEOUT_DEFAULT),
+            timeout: Duration::from_millis(OTEL_EXPORTER_OTLP_TIMEOUT_DEFAULT),
         }
     }
 }
diff --git a/opentelemetry-otlp/src/exporter/tonic/mod.rs b/opentelemetry-otlp/src/exporter/tonic/mod.rs
index 9e2b54c631..3b4bf03d42 100644
--- a/opentelemetry-otlp/src/exporter/tonic/mod.rs
+++ b/opentelemetry-otlp/src/exporter/tonic/mod.rs
@@ -200,7 +200,7 @@ impl TonicExporterBuilder {
             .or(env::var(OTEL_EXPORTER_OTLP_TIMEOUT).ok())
         {
             Some(val) => match val.parse() {
-                Ok(seconds) => Duration::from_secs(seconds),
+                Ok(seconds) => Duration::from_millis(seconds),
                 Err(_) => config.timeout,
             },
             None => config.timeout,